This study provided a preliminary framework for the effects of L. essential oil (EO) on sea bass () health status over a 60-day feeding trial. Fish were fed twice a day until apparent satiety with three different diets: a control diet (CD), and two experimental diets supplemented with 100 (D100) and 200 (D200) ppm of oregano EO. No mortality was observed in each treatment. Feeding on D100 diet resulted in high growth performances and better food conversion and protein efficiency ratios. Additionally, the supplementation of 100 ppm EO diet also improved (P < 0.05) hepatosomatic and viscerosomatic indices, compared both to control and D200 diets. EO feeding positively affected (P < 0.05) several serum biochemical indices (amylase activity and total proteins, glucose, triglycerides, and cholesterol levels). Focusing on the antioxidant potential of blood, D100 led to the highest (P < 0.05) ferric reducing antioxidant power values and the lowest (P < 0.05) thiobarbituric acid-reactive substances levels in blood.

中文翻译：

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饲料添加牛至精油对鲈鱼（Dicentrarchus labrax）的影响：代谢状态和生长性能的初步框架


这项研究为 60 天的喂养试验中 L. 精油 (EO) 对鲈鱼健康状况的影响提供了初步框架。每天用三种不同的饮食喂鱼两次，直至出现明显饱腹感：对照饮食 (CD) 和补充有 100 (D100) 和 200 (D200) ppm 牛至 EO 的两种实验饮食。每种治疗均未观察到死亡率。使用 D100 日粮喂养可实现高生长性能以及更好的食物转化率和蛋白质效率比。此外，与对照和 D200 饮食相比，补充 100 ppm EO 饮食还改善了 (P < 0.05) 肝体和内脏指数。 EO 喂养对多种血清生化指标（淀粉酶活性和总蛋白、葡萄糖、甘油三酯和胆固醇水平）产生积极影响（P < 0.05）。着眼于血液的抗氧化潜力，D100 导致血液中铁还原抗氧化能力值最高（P < 0.05），硫代巴比妥酸反应物质水平最低（P < 0.05）。